>>64162110
Get a FILBE (24L) for $65 or so. If you need more space, Savotta, Hill People, Crossfire, Snigel are good brands.
Some anons are experimenting with aliexpress / temu backpacks but the jury is still out on whether they're field-dependable. Best to play it safe and go with no. IR compliance is often the first corner cut, then stitching and overall material quality. Nobody likes looking like a lighthouse under IR. Nobody likes shit blowing out all over the ground like mom's spaghetti when you've still got a long way to go.
Short answer is just get a FILBE and you're good to go.